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1   /*****************************************************************
2    * Licensed to the Apache Software Foundation (ASF) under one   *
3    * or more contributor license agreements.  See the NOTICE file *
4    * distributed with this work for additional information        *
5    * regarding copyright ownership.  The ASF licenses this file   *
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7    * "License"); you may not use this file except in compliance   *
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17   * under the License.                                           *
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19  
20  package org.apache.james.smtpserver;
21  
22  import org.apache.james.util.mail.dsn.DSNStatus;
23  
24  /***
25    * Handles EXPN command
26    */
27  public class ExpnCmdHandler implements CommandHandler {
28  
29      /***
30       * The name of the command handled by the command handler
31       */
32      private final static String COMMAND_NAME = "EXPN";
33  
34      /***
35       * Handler method called upon receipt of a EXPN command.
36       * This method informs the client that the command is
37       * not implemented.
38       *
39       * @see org.apache.james.smtpserver.CommandHandler#onCommand(SMTPSession)
40       */
41      public void onCommand(SMTPSession session) {
42          String responseString = "502 "+DSNStatus.getStatus(DSNStatus.PERMANENT,DSNStatus.SYSTEM_NOT_CAPABLE)+" EXPN is not supported";
43          session.writeResponse(responseString);
44      }
45  
46  }